90wt gear oil substitute?

Discussion in '40- & 55-Series Tech' started by vagabond, Oct 2, 2006.

  1. vagabond

    vagabond

    Messages:
    118
    Location:
    Texas
    With all the improvements on oil, what could be acceptable to use rather than 90 in my '75?
  2. Cruiserdrew

    Cruiserdrew SILVER Star

    Messages:
    11,869
    Location:
    Sacramento, CA
    Use 80w-90 GL5. It's available everywhere.
  3. Poser

    Poser Oh...Durka Durka Durka. s-Moderator Supporting Vendor

    Messages:
    19,668
    Location:
    MN


    Welcome.




    What are you trying to gain by not running 80W-90 gear oil in your old truck?

  4. more horsepower!!!!!
  5. Cruiserdrew

    Cruiserdrew SILVER Star

    Messages:
    11,869
    Location:
    Sacramento, CA
    I would try some things that look like gear oil and see how far you get, and what you learn. Some suggestions:

    Karo syrup
    Used motor oil
    Maple syrup (winter only)


    :flipoff2:
  6. FoYoChe

    FoYoChe

    Messages:
    176
    Location:
    Northwest
    we use a 75-90W mobil synthetic gear oil in some expensive gearboxes here, and it seems to drop oil temperature about 30 degrees, makes the gearboxes survive instead of dying once a year. problem is it's $8 a bottle. but you might find a better price on it somewhere
  7. Morse_FJ40

    Morse_FJ40 SILVER Star

    Messages:
    827
    Location:
    Silverdale,WA
    I run Amsoil 75-90 synthetic, and love it!!!
  8. vagabond

    vagabond

    Messages:
    118
    Location:
    Texas
    90wt

    thank you all for your input.
    Glad to hear of your recommendations!
  9. andrewfarmer

    andrewfarmer

    Messages:
    800
    Location:
    Wellington, NZ
    use Redline shockproof- choose the viscosity to suit your driving style - this stuff also works well with water in it - for some reason it doesnt break down the way std oils do.
  10. Advent

    Advent

    Messages:
    548
    Location:
    Juneau, Ak; Fairbanks, AK
    I get Mobil Synthetic Gear Lube in the $5 bucket. $99.

    Mobil 1 is more expensive. Supposedly it's the same stuff plus some limited slip additives. Since I don't have a limited slip, I don't use it.
  11. n2666s

    n2666s

    Messages:
    2,585
    royal purple, great stuff but pricey :(

    Lou

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